The Goodyear Assurance series tires are the only decent tires that Goodyear makes as far as street tires (IMO). If the difference between the Michelins and the cheapest tire (the Goodyears) is that small, go Michelin.
http://twoseatsorless.com/wp-content/uploads/2009/11/2000-Ford-SVT-Cobra-R-LS-500x375.jpg
They must make a handful of replica cars because I see a few Mustangs that look just like this everyday.
Porsche Club events are awesome! Good group of people running it, nice setups (that one in particular took up 3 parking lots, it was massive), and really cheap for how many runs you get.